Police have identified a man whose body was found in a truck in a field in the 1500 block of River Road in San Marcos Saturday night as James Roderick Dorman, age 48, of San Antonio. (DOB 06-09-1959).

Preliminary autopsy results indicate Dorman may have died of natural causes, a heart attack, said Sgt. Mike Wellman, of the Criminal Investigations Division. Final results of the autopsy will not be available for several weeks.

A citizen noticed the silver blue 1989 Ford pickup earlier Saturday and called police when he saw the truck still in the field around 7:47 p.m. Saturday night.

When officers arrived, the truck was in gear with headlights on and the engine off.

Officers who discovered Dorman’s body noticed a wound to the man’s left cheek that was identified in the autopsy as a laceration possibly caused during the heart attack.

Police have notified the family of his death. The investigation is ongoing to gather additional details surrounding his death.